dict1={"name":"周瑜","age":32,"id":"001"}
#字典中增加一个键值对’sex’:’男’
dict1["sex"] = "男"
print(dict1)
# ；#删除键’id’；
dict1.pop("id")
print(dict1)

#将键’age’的值修改为26
dict1["age"]=26
print(dict1)


print(len(dict1))
print(max(dict1))
print(min(dict1))